You're also comparing two different ratings in your bag comparisons. A -15 rated OV against a 0 degree WM. Hell, the OV better have more down load in it when using that example. I guess you don't want to consider that a -10 WM Bristlecone has 45oz of higher fill power down than the -15 OV. You really should use both brands side by side and compare before trying to claim that OV bags are warmer than directly comparable WM bags.Sneaky
I think you missed my point. I am aware of the difference between fill weights. I don’t believe this is an apples to oranges comparison. WM states 850+ fill weight OV states 800+ fill weight using 900 to 800 is showing a bias on your part. The difference between 850+ and 800+ is minimal. Even using 900 to 800 you even showed the OV has more loft as per your math.
Comparison-
Fill weight:
WM- 32oz of 850+
OV- 38oz of 800+
Overall weight:
WM- 2lbs 15oz
OV- 3lbs 3.5oz
Price:
WM- $700
OV-$300
As I previously stated Western Mountaineering makes great bags and if given both bags out in the field I do not believe I would be able to rate one over the other. The OV should be slightly warmer just based on the volume the down takes up ( 30,476 vs 28,800 )The VERY noticeable difference come when you pay for them. The WM is approximately $700. Where as the OV is $300. I can not see spending $400 more for a 4.5oz weight savings. Plus as you said Outdoor Vitals uses DWR down where as Western Mountaineering does not. A plus for Outdoor Vitals IMO.
If you go with the -10 WM bags the difference in price get greater and the WM bags get narrower. But the OV still holds its own in comparing overall weight and fill weight.
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